This file is indexed.

prerm is in libpam-krb5 4.6-2.

This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.

The actual contents of the file can be viewed below.

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#!/bin/sh

set -e

# pam-auth-update --remove removes the named profile from the active config.
# It arguably should be called during deconfigure as well, but deconfigure
# can happen in some cases during a dist-upgrade and we don't want to
# deconfigure all PAM modules in the middle of a dist-upgrade by accident.
#
# More importantly, with the current implementation, --remove also removes
# all local preferences for the named config (such as whether it's enabled
# or disabled), which we don't want to do on deconfigure.
#
# This may need to change later as pam-auth-update evolves.

if [ "$1" = "remove" ] ; then
    pam-auth-update --package --remove krb5
fi